Java tutorial
/* * Copyright Andrei Goumilevski * This file licensed under GPLv3 for non commercial projects * GPLv3 text http://www.gnu.org/licenses/gpl-3.0.html * For commercial usage please contact me * gmlvsk2@gmail.com * */ package net.kamradtfamily.mongorest; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import static javax.servlet.http.HttpServletResponse.*; import javax.servlet.ServletConfig; import javax.servlet.annotation.WebServlet; import com.mongodb.DB; import com.mongodb.DBObject; import com.mongodb.DBCursor; import com.mongodb.gridfs.GridFS; import com.mongodb.gridfs.GridFSDBFile; import com.mongodb.gridfs.GridFSInputFile; import com.mongodb.util.JSON; import java.util.logging.Logger; import java.util.*; import java.io.*; import java.util.logging.Level; @SuppressWarnings("serial") @WebServlet(name = "GridfsServlet") public class GridfsServlet extends SkeletonMongodbServlet { private static final Logger log = Logger.getLogger(GridfsServlet.class.getName()); private final ThreadLocal<StringBuilder> tl = new ThreadLocal<StringBuilder>() { @Override protected synchronized StringBuilder initialValue() { return new StringBuilder(1024 * 4); } }; private final Map<String, GridFS> fs_cache = Collections.synchronizedMap(new HashMap<String, GridFS>()); // -------------------------------- @Override public void init() throws ServletException { ServletConfig config = getServletConfig(); String name = getServletName(); log.log(Level.FINE, "init() {0}", name); } // -------------------------------- @Override public void destroy() { ServletConfig config = getServletConfig(); String name = getServletName(); log.log(Level.FINE, "destroy() {0}", name); if (fs_cache != null) fs_cache.clear(); } // POST // ------------------------------------ @Override protected void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { log.fine("doPost()"); InputStream tmp = req.getInputStream(); InputStream is = new BufferedInputStream(tmp); String db_name = req.getParameter("dbname"); String bucket_name = req.getParameter("bucketname"); if (db_name == null || bucket_name == null) { String names[] = req2mongonames(req); if (names != null) { db_name = names[0]; bucket_name = names[1]; } if (db_name == null) { error(res, SC_BAD_REQUEST, Status.get("param name missing")); return; } } if (bucket_name == null) bucket_name = "fs"; String file_name = req.getParameter("filename"); if (file_name == null) { error(res, SC_BAD_REQUEST, Status.get("param name missing")); return; } DB db = mongo.getDB(db_name); String fs_cache_key = db_name + bucket_name; GridFS fs = fs_cache.get(fs_cache_key); if (fs == null) { fs = new GridFS(db, bucket_name); fs_cache.put(fs_cache_key, fs); } GridFSDBFile db_file_old = fs.findOne(file_name); if (db_file_old == null) { error(res, SC_NOT_FOUND, Status.get("file doe not exists, use PUT")); return; } String ct = req.getContentType(); GridFSInputFile db_file = fs.createFile(file_name); if (ct != null) db_file.setContentType(ct); OutputStream os = db_file.getOutputStream(); final int len = 4096; byte data[] = new byte[len]; int n; while ((n = is.read(data, 0, len)) > 0) { os.write(data, 0, n); } os.close(); is.close(); out_json(req, Status.OK); } // PUT // ------------------------------------ @Override protected void doPut(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { log.fine("doPut()"); InputStream tmp = req.getInputStream(); InputStream is = new BufferedInputStream(tmp); String db_name = req.getParameter("dbname"); String bucket_name = req.getParameter("bucketname"); if (db_name == null || bucket_name == null) { String names[] = req2mongonames(req); if (names != null) { db_name = names[0]; bucket_name = names[1]; } if (db_name == null) { error(res, SC_BAD_REQUEST, Status.get("param name missing")); return; } } if (bucket_name == null) bucket_name = "fs"; String file_name = req.getParameter("filename"); if (file_name == null) { error(res, SC_BAD_REQUEST, Status.get("param name missing")); return; } DB db = mongo.getDB(db_name); String fs_cache_key = db_name + bucket_name; GridFS fs = fs_cache.get(fs_cache_key); if (fs == null) { fs = new GridFS(db, bucket_name); fs_cache.put(fs_cache_key, fs); } GridFSDBFile db_file_old = fs.findOne(file_name); if (db_file_old != null) { error(res, SC_BAD_REQUEST, Status.get("file already exists, use POST")); return; } String ct = req.getContentType(); GridFSInputFile db_file = fs.createFile(file_name); if (ct != null) db_file.setContentType(ct); OutputStream os = db_file.getOutputStream(); final int len = 4096; byte data[] = new byte[len]; int n; while ((n = is.read(data, 0, len)) > 0) { os.write(data, 0, n); } os.flush(); os.close(); is.close(); out_json(req, Status.OK); } // DELETE // ------------------------------------ @Override protected void doDelete(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { log.fine("doDelete()"); String db_name = req.getParameter("dbname"); String bucket_name = req.getParameter("bucketname"); if (db_name == null || bucket_name == null) { String names[] = req2mongonames(req); if (names != null) { db_name = names[0]; bucket_name = names[1]; } if (db_name == null) { error(res, SC_BAD_REQUEST, Status.get("param name missing")); return; } } if (bucket_name == null) bucket_name = "fs"; DB db = mongo.getDB(db_name); String fs_cache_key = db_name + bucket_name; GridFS fs = fs_cache.get(fs_cache_key); if (fs == null) { fs = new GridFS(db, bucket_name); fs_cache.put(fs_cache_key, fs); } // mongo auth String user = req.getParameter("user"); String passwd = req.getParameter("passwd"); if (user != null && passwd != null && (!db.isAuthenticated())) { boolean auth = db.authenticate(user, passwd.toCharArray()); if (!auth) { res.sendError(SC_UNAUTHORIZED); return; } } String file_name = req.getParameter("filename"); if (file_name == null) { error(res, SC_BAD_REQUEST, Status.get("param name missing")); return; } fs.remove(file_name); out_json(req, Status.OK); } // GET // ------------------------------------ @Override protected void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { log.fine("doGet()"); String db_name = req.getParameter("dbname"); String bucket_name = req.getParameter("bucketname"); if (db_name == null || bucket_name == null) { String names[] = req2mongonames(req); if (names != null) { db_name = names[0]; bucket_name = names[1]; } if (db_name == null) { error(res, SC_BAD_REQUEST, Status.get("param name missing")); return; } } if (bucket_name == null) bucket_name = "fs"; DB db = mongo.getDB(db_name); String fs_cache_key = db_name + bucket_name; GridFS fs = fs_cache.get(fs_cache_key); if (fs == null) { fs = new GridFS(db, bucket_name); fs_cache.put(fs_cache_key, fs); } // mongo auth String user = req.getParameter("user"); String passwd = req.getParameter("passwd"); if (user != null && passwd != null && (!db.isAuthenticated())) { boolean auth = db.authenticate(user, passwd.toCharArray()); if (!auth) { res.sendError(SC_UNAUTHORIZED); return; } } String op = req.getParameter("op"); if (op == null) op = "get"; StringBuilder buf = tl.get(); // reset buf buf.setLength(0); // list if ("get".equals(op)) { String file_name = req.getParameter("filename"); if (file_name == null) { error(res, SC_BAD_REQUEST, Status.get("param name missing")); return; } GridFSDBFile db_file = fs.findOne(file_name); if (db_file == null) { error(res, SC_NOT_FOUND, Status.get("file does not exists")); return; } res.setContentLength((int) db_file.getLength()); String ct = db_file.getContentType(); if (ct != null) res.setContentType(ct); OutputStream os = res.getOutputStream(); long l; while ((l = db_file.writeTo(os)) > 0) ; os.flush(); os.close(); } // list else if ("list".equals(op)) { DBCursor c = fs.getFileList(); if (c == null) { error(res, SC_NOT_FOUND, Status.get("no documents found")); return; } int no = 0; buf.append("["); while (c.hasNext()) { DBObject o = c.next(); JSON.serialize(o, buf); buf.append(","); no++; } if (no > 0) buf.setCharAt(buf.length() - 1, ']'); else buf.append(']'); out_str(req, buf.toString(), "application/json"); } // info else if ("info".equals(op)) { String file_name = req.getParameter("filename"); if (file_name == null) { error(res, SC_BAD_REQUEST, Status.get("param name missing")); return; } GridFSDBFile db_file = fs.findOne(file_name); if (db_file == null) { error(res, SC_NOT_FOUND, Status.get("no documents found")); return; } buf.append("{"); buf.append(String.format("\"ContentType\":%s,", db_file.getContentType())); buf.append(String.format("\"Length\":%d,", db_file.getLength())); buf.append(String.format("\"MD5\":%s", db_file.getMD5())); buf.append("}"); out_str(req, buf.toString(), "application/json"); } else res.sendError(SC_BAD_REQUEST); } }